I use it to extend the number of rounds I can shoot without cleaning. When I first started coating using Moly, I didn't notice an increase in accuracy for any particular barrel, but it didn't fall off as fast. Now, I work up all my loads from the get go with coated bullets, and have for many years.
I started using Moly in a 17 Rem that would not go more than 20 rounds, without a major cleaning. Bullets breaking up before they hit the target, keyholing etc. After reading about all the problems one MIGHT have with Moly, plus the fact that it rubs off too easily, I switched to Tungsten Disulfide. The Tungsten is very difficult to remove compared to the Moly. I think the correct chemical symbol is
WS2. With the Tungsten coating I can literally go 100+ rounds before accuracy becomes unacceptable for varmints with pretty much any of my fast center fires like the 17 Rem, 204 Ruger, 22-250 AI, 6mm-284. One time on a P-Dog hunt I almost hit 150 rounds with a 204 ruger ER Shaw barell and it was still giving me 100% hits on P-Dogs. When I eventually cleaned it there was very little copper sign considering.
I also have used it with rougher factory barrels that coppered up rapidly, less then 15 shots. Again, it increased the number of rounds I could fire without heavy copper causing problems by 2-3 times.
Now, I pretty much use it with everything I shoot from 17 Rem to 50 BMG, since I have a system set up that makes coating them easy and I know it will give me more shooting time between cleaning.
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